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Brand: Cummins Inc.
Cummins 312/315 kVA Diesel Generator Set
Description
Overview
The Cummins 312/315 kVA Diesel Generator Set is a fully integrated power generation system built around Cummins’ proven QSL9 six-cylinder industrial diesel engine platform, with 312 kVA and 315 kVA ratings that depend on frequency and duty class in the 250 kW power class. This rating pairing places the unit in one of Cummins’ most widely deployed mid-range commercial genset categories, trusted globally for stationary standby and continuous prime power applications across commercial, industrial, and infrastructure projects.
As a supplier of genuine Cummins Inc. power generation equipment, Seven Star LLC offers the 312/315 kVA diesel generator set to commercial developments, industrial facilities, and critical infrastructure projects across the Sultanate of Oman, Muscat, and the wider GCC. Backed by Cummins’ more than a century of engineering heritage, this generator set is engineered to deliver dependable backup and prime power wherever grid reliability cannot be assumed.
Engine and Alternator Design
At the heart of the Cummins 312/315 kVA generator set is a rugged, 4-cycle, 6-cylinder in-line turbocharged diesel engine from the Cummins QSL9 family, engineered for low emissions, fast response to load changes, and reliable performance across demanding duty cycles. The engine pairs with a low-reactance, 2/3-pitch wound brushless alternator, delivering low waveform distortion even under non-linear loads and providing enhanced fault-clearing short-circuit capability for connected electrical systems.
An optional Permanent Magnet Generator (PMG) configuration is available to further enhance motor starting performance and fault-clearing capability in demanding industrial applications. The alternator’s Class H insulation system ensures long-term thermal durability, while the full-authority electronic engine control delivers a superior power-to-weight ratio for a compact overall generator set footprint.
Control System and Monitoring
The Cummins 312/315 kVA generator set is equipped with Cummins’ PowerCommand control system, providing an intuitive digital interface for monitoring engine and alternator parameters, alarm status, and automatic start/stop functionality. This control architecture supports seamless integration with automatic transfer switches (ATS) for standby power applications, allowing the generator set to respond automatically to utility power interruptions without manual intervention.
The set-mounted control panel provides real-time visibility into voltage, current, frequency, and engine operating parameters, while built-in engine protection safeguards against conditions such as low lube oil pressure, high coolant temperature, and overspeed. This level of monitoring and protection is essential for unattended standby installations where early fault detection prevents costly downtime.
Key Features
The Cummins 312/315 kVA Diesel Generator Set combines proven engine technology with flexible configuration options. Core capabilities include:
- Two ratings are listed, 312 kVA (250 kW) and 315 kVA (252 kW); which one is the prime or standby rating depends on the frequency (50 or 60 Hz), confirmed at quotation.
- Cummins QSL9 series 6-cylinder, 4-cycle, turbocharged industrial diesel engine.
- Low-reactance, 2/3-pitch wound alternator with Class H insulation and fault-clearing short-circuit capability.
- Optional Permanent Magnet Generator (PMG) for enhanced motor starting performance.
- PowerCommand digital control system with automatic start/stop and comprehensive engine protection.
- Remote monitoring capability via optional network communication modules for unattended standby sites.
- Available in both 50Hz and 60Hz configurations to match regional grid requirements.
- Sound-attenuated, weather-protective canopy options for outdoor installation.
- Integrated fuel tank options for uninterrupted extended-duration operation.
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Industrial Applications
The Cummins 312/315 kVA generator set is well suited to commercial buildings, light industrial facilities, retail developments, and infrastructure projects across Oman that require dependable backup power in the 250 kW class. Its compact footprint and standard sound-attenuated canopy options make it practical for installation in space-constrained sites while still meeting noise requirements for occupied commercial environments.
Seven Star LLC supplies this Cummins generator set to hospitality developments, healthcare facilities, and industrial plants throughout the Sohar and Salalah economic zones and the broader GCC region, supporting both emergency standby power and continuous prime power operation for sites operating off-grid or in areas with unreliable utility supply.
Technical Specifications
Full technical parameters for the Cummins 312/315 kVA diesel generator set:
| Parameter | Specification |
|---|---|
| Manufacturer | Cummins Inc. |
| Prime Power Rating | 312 kVA (250 kW) |
| Standby Power Rating | 315 kVA (252 kW) |
| Engine Family | Cummins QSL9 Series, 6-Cylinder Turbocharged Diesel |
| Alternator | Brushless, Low-Reactance 2/3 Pitch, Class H Insulation |
| Control System | PowerCommand Digital Control, Auto Start/Stop |
| Frequency Options | 50Hz / 60Hz |
| Enclosure Options | Sound-Attenuated & Weather-Protective Canopy, Open Set |
| Fuel Type | Diesel |
Why Choose Seven Star LLC for Cummins Power Generation
Sizing a 250 kW-class generator set correctly means accounting for real starting loads, not just steady-state demand, and getting this wrong on a commercial or healthcare project in Oman can mean a costly re-order mid-construction. Seven Star LLC’s team works through actual load schedules with consulting engineers and contractors before confirming a Cummins 312/315 kVA order, including guidance on when the optional Permanent Magnet Generator configuration is worth specifying for motor-heavy electrical loads.
We also support customers through the practical logistics of genset delivery in Oman: confirming 50Hz frequency configuration against the site’s utility standard, coordinating canopy and fuel tank options for the installation footprint, and offering technical support on commissioning and ongoing maintenance questions across Muscat, Sohar, and the wider GCC, including guidance on spare-parts stocking for sites where extended-duration prime power operation is expected.
Request a Quote for Cummins 312/315 kVA Diesel Generator Set
To submit a formal Request for Quote (RFQ), confirm current availability, lead time and configuration, or arrange technical consultation for the Cummins 312/315 kVA Diesel Generator Set, please contact the power generation division at Seven Star LLC today. Our engineers are ready to assist with rapid sourcing, sizing, and installation planning for your standby or prime power project across Oman and the GCC.
Related Products
Datasheets & Documents
- Datasheet Cummins 312/315 kVA Diesel Generator Set Datasheet Download
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About brand
Cummins Inc. is an American maker of diesel and natural gas engines, generator sets and power systems. It was founded on 3 February 1919 in Columbus, Indiana, by mechanic Clessie Cummins with financial backing from banker William Glanton Irwin. The company was called Cummins Engine Company until 2001 and is still headquartered in Columbus, Indiana, and listed on the New York Stock Exchange.
Seven Star LLC lists Cummins diesel generator sets, generator-drive engines and engine and control spare parts, and supplies them to contractors and facility operators in Oman against the model, specification and part numbers on the equipment.
Cummins Inc. company profile
| Founded | 3 February 1919, Columbus, Indiana, USA |
|---|---|
| Founders | Clessie Cummins, with backing from banker William Glanton Irwin |
| Headquarters | Columbus, Indiana, USA |
| Ownership | Public company, New York Stock Exchange (CMI) |
| Group brands | STAMFORD and AvK alternators (Cummins Generator Technologies), Fleetguard filtration |
| Product families | Diesel and gas engines, standby and prime power generator sets, PowerCommand controllers, transfer switches, filters and spare parts |
Milestones
- 1919: Cummins Engine Company is founded in Columbus, Indiana.
- 1929: Clessie Cummins drives a diesel-powered Packard, presented as America's first diesel car.
- 1933: The Model H engine succeeds in railroad switchers.
- 2001: The company is renamed Cummins Inc.
Cummins equipment on this page
The generator sets listed are the C150D5 at 150 kVA, the C275D5 at 275 kVA, a set in the 312/315 kVA class and the C1000D5B at 1000 kVA. In the Cummins naming, the number after C is the nominal kVA rating and D5 marks a diesel set for 50 Hz. Generator-drive engines listed are the QST30-G4, QSK19-G4, QSX15-G8 and QSK60-G4, the last a 16-cylinder engine. Spare parts are listed by Cummins part number: head gasket set 4011502, starter motor 3283330, fuel injection pump 3937025 and the PowerCommand display and control assembly 300-6314-01.
Where Cummins generator sets are used
Standby power for hospitals, towers, data rooms and pumping stations; prime power on construction camps, remote oilfield sites and quarries; and paralleled sets for larger loads. High ambient temperature and dust are normal design conditions for sets working in the GCC, so cooling package and enclosure choices deserve attention at the inquiry stage.
Cummins Inc. products we list
Ordering Cummins parts: what we need
For engine parts send the engine serial number (ESN) and model from the engine dataplate, together with the part number if you have it. For generator set parts and controls send the genset model, specification letter and serial number from the set nameplate. For a complete set tell us the kVA rating and duty (standby or prime), voltage and frequency, open or enclosed build, the site ambient temperature and altitude, and the transfer switch or paralleling requirement.
Facts checked against published Cummins company histories, October 2026.
Browse Cummins Inc. products by category: Diesel Generator Spare Parts, Diesel Generator.
FAQ
Questions about the Cummins 312/315 kVA Diesel Generator Set
Answers from our engineering team on installation, compatibility and integration.
01What is the difference between the Prime and Standby ratings on this Cummins generator set?
Prime Power is the rating for continuous, variable-load operation over unlimited hours, while Standby Power applies to emergency backup use during utility outages, in line with ISO 8528-1 definitions.
02What engine powers this Cummins 312/315 kVA generator set?
The generator set is built around a Cummins QSL9 series 6-cylinder, 4-cycle turbocharged industrial diesel engine, known for reliable performance and fast response to load changes.
03Is this generator set available for both 50Hz and 60Hz applications?
Yes. Configurations are available in both 50Hz and 60Hz to match regional grid frequency requirements.
04What control system does the generator set use?
It uses Cummins' PowerCommand digital control system, providing automatic start/stop, real-time monitoring, and comprehensive engine and alternator protection.
05Does Seven Star LLC supply genuine Cummins equipment?
Yes. Seven Star LLC supplies genuine Cummins Inc. power generation equipment across Oman and the GCC, with full technical support.
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